在这种情况下，广告代理机构应发挥何种作用？

And in that case, what role should an advertising agency play?

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但这说明了在减肥问题上，政策干预和个人努力应发挥协同作用。

But it suggests a synergy between policy intervention and personal efforts to lose weight.

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机构应经常如实地评估其进展，并强调所有参与者都应发挥积极作用。

Groups should assess their progress regularly and honestly, and emphasize that all participants are responsible for playing a positive role.

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